C1- Atoms, elements and compounds
- Created by: liv.moz
- Created on: 02-05-22 13:00
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- C1- Atoms, elements and compounds
- Atoms
- Building blocks of all matter
- Everything is made out of atoms.
- Smallest particle of an element.
- If a solid, liquid or gas is made up of only ONE TYPE of ATOM, we say it is an element.
- Elements
- Metal elements are on the LEFT-hand side of the periodic table.
- When 2 elements join, the end is usually ___ide.
- Isotopes are forms of an element that have the same number of protons but different number of neutrons.
- Realtive atomic mass
- The number of times heavier an atom is than 1-12th of a Carbon-12 atom.
- To calculate: total mass of atoms/ total number of atoms.
- The number of times heavier an atom is than 1-12th of a Carbon-12 atom.
- Elements
- Relative charge and mass
- Protons: Charge: +1 Mass: 1
- Neutrons: Charge: 0 Mass: 1
- Electrons: Charge: -1 Mass: 0.0005
- Overall charge of an atom: neutral, no overall charge.
- The nucleus contains most of the atom's mass.
- Building blocks of all matter
- Elements
- Metal elements are on the LEFT-hand side of the periodic table.
- When 2 elements join, the end is usually ___ide.
- Isotopes are forms of an element that have the same number of protons but different number of neutrons.
- Realtive atomic mass
- The number of times heavier an atom is than 1-12th of a Carbon-12 atom.
- To calculate: total mass of atoms/ total number of atoms.
- The number of times heavier an atom is than 1-12th of a Carbon-12 atom.
- Compunds
- They are formed when 2 or more elements are chemically combined.
- Elements and compunds are represented by chemical symbols.
- When 3 or more elements combine and two of them are hydrogen and oxygen (OH), the name ends with hydroxide.
- Potassium+ hydrogen+ oxygen--> Potassium hydroxide.
- When 3 or more elements combine and one of them is oxygen, the ending is ___ate.
- Calcium+oxygen+ carbon--> Calcium carbonate.
- Balanced equations.
- Mg+ O2-> MgO
- 2Mg+O2-> 2MgO
- Fe + Cl2-> FeCl3
- 2Fe + 3Cl2-> 2FeCl3
- Zn+HCl-> ZnCl2+ H2
- Zn+2HCl->ZnCl2+H2
- Mg+ O2-> MgO
- When 3 or more elements combine and two of them are hydrogen and oxygen (OH), the name ends with hydroxide.
- Mixtures
- Consist of 2 or more substances not chemically combined together.
- How can they be separated?
- Filtration: Used to separate insoluable solids from liquids. Filter paper has small holes allowing small molecules and dissolved ions pass through, but not the undissolved solid.
- Crystilisation/Evaporation: Produces solid crystals from a solution. When solution is warmed, some of the solvent evaporates leaving crystals behind.
- Atoms
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